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Investigation of Electrical Properties and Microstructure of PA6/PPO Nanoblends Containing CNT/CCB

Farhadpour, Mohammad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53342 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Bagheri, Reza; Pircheraghi, Gholamreza
  7. Abstract:
  8. Polyamide 6 (PA6) / Polyphenylene oxide (PPO) nanoblends containing carbon naotube (CNT)/conductive carbon black (CCB) with incorporation of PPO-g-MA compatibilizer, physical and chemical dispersing agents were prepared via melt blending method. The effect of carbonic nano additives weight percent, incorporation of physical dispersing agent, PA6 viscosity, PPO weight percent and sequential mixing were investigated. Modified CNT with physical dispersing agent studied by thermal gravimetric analysis (TGA), fourier-transform infrared spectroscopy (FTIR) and Raman spectroscopy and PPO-g-MA studied by FTIR and titration. Also, nanoblend morphologies, CNT/CCB dispersability and CNT/CCB selective localization examined by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). It was concluded that physical dispersing agents improve distribution and dispersability of CNTs as well as nanoblends microstructure. Based on electrical conductivity measurement, results showed that when PPO wt% increase from 25 wt% to 55%, electrical resisitivity decrease from 1010 Ωcm to 106 Ωcm due to double percolation effect. It was also observed that using injection grade of PA6 instead of extrusion grade and sequential mixing lead to better electrical conductivity. Interestingly results indicated that using physical dispersing agents and increasing the weight percent of PPO lead to higher electrical conductivity due to reduction of PA6 transcrystalline phase on CNTs. Also, mechanical, rheologocal and thermal properties of nanoblends were examined with tensile test, impact test, rheometer and differential scanning calorimetry (DSC)
  9. Keywords:
  10. Polyamide 6 ; Carbon Nanotubes ; Physical Dispersing Agents ; Chemical Dispersing Agents ; Conductive Carbon Black (CCB) ; Electrical Conductive Nanoblends ; Polyphenylene Oxide (PPO)

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